In the half-wave rectifier circuit shown. Which one of the following wave forms is true for VCD, the output across C and D?

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A full-wave rectifier circuit along with the input and output voltages is shown in the figure.

The contribution to the output voltage from diode – 2 is :

(a) A, C                       (b) B, D
(c) B, C                       (d) A, D

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The i-V characteristic of a P-N junction diode is shown below. The approximate dynamic resistance of the P-N junction when a forward bias of 2 volt is applied

(a) 1 Ω
(b) 0.25 Ω 
(c) 0.5 Ω
(d) 5 Ω

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The given figure shows the wave forms for two inputs A and B and that for the output Y of a logic circuit. The logic circuit is 

(a) An AND gate                   (b) An OR gate
(c) A NAND gate                   (d) An NOT gate

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The variation of anode current in a triode corresponding to a change in grid potential at three different values of the plate potential is shown in the diagram. The mutual conductance of the triode is 

           

(a) 2.5 m mho      (b) 5.0 m mho
(c) 7.5 m mho      (d) 10.0 m mho

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A silicon speciman is made into a P-type semi-conductor by dopping, on an average, one Indium atom per 5×107 silicon atoms. If the number density of atoms in the silicon specimen is 5×1028 atoms/m3 then the number of acceptor atoms in silicon per cubic centimetre will be

(a) 2.5×1030 atoms/cm3                   (b) 1.0×1013 atoms/cm3
(c) 1.0×1015 atoms/cm3                   (d) 2.5×1036 atoms/cm3

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Types of semiconductors
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The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature

(a) Decreases exponentially with increasing band gap
(b) Increases exponentially with increasing band gap
(c) Decreases with increasing temperature
(d) Is independent of the temperature and the band gap

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Energy band theory
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A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is 

(a) 0.2 A
(b) 0.4 A
(c) Zero
(d) 0.1 A

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 In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be 

(a) 3.4 mA
(b) 2 mA
(c) 2.5 mA
(d) 3 mA

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Current in the circuit will be 


(a) 540A
(b) 550A
(c) 510A
(d) 520A

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Applications of PN junction
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